Numerical Modelling of Ship Stern Flows

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Computational Fluid Dynamics (CFD) is becoming a widely used complement to towing tank tests in order to predict the resistance and the wake field during the design phase of a ship. In addition, a lot of research is done on developing valid and effective models for simulating self propulsion and manoeuvring with an operational propeller and ruder configuration.
The purpose of this project is to make reliable CFD calculation of the flow arounf the stern and particularly the inflow of the propeller disc (the wake) for a given ship in model scale. The results will be compared with towing tank measurements performed on the model in order to verify the simulations. The flow phenomena such as cross-flow, separation and vortex generation around the ship hull will be studied and compared with flow pain tests and general hull flow theory.
The validation of the CFD simulations will be investigated with respect to the mesh density, the boundary layer modellung and the use of different turbulence models.
An actuator disc will be used to simulate the axial momentum introduced by the propeller, making it possible to examine the influence of the propeller action on the stern hull flow.
The CFD simulations in this project are performed using the software STAR-CCM+.

Technical University of Denmark
Monday, January 1, 2007
Author Name: 
P. L. Nielsen